A different user-centered design model is universal design, which again centers on users, but with the added framing of designing for the most diverse range of users possible. UD has not been conceived as a one-size-fits-all approach. It does not reduce multiple personas to an average but takes people’s actual needs into account. It just takes as many needs into account as possible [@WhatUniversalDesign]. UD came not into existence through designers’ practices but was driven through processes in liberal political, economic, and scientific structures concerned with defining the disabled user and designing for them.